CN102055639A - Method for establishing remote access virtual private network connection and local access concentrator - Google Patents
Method for establishing remote access virtual private network connection and local access concentrator Download PDFInfo
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Abstract
The invention provides a method for establishing remote access virtual private network (Access VPN) connection and a local access concentrator (LAC). The method comprises that: when determining that a legal remote user needs to access an Intranet, the LAC determines tunnel connection priority of each layer two tunneling network server (LNS) according to the quality of a link between each LNS and the LAC, an LNS with the highest tunnel connection priority is selected to establish tunnel connection with the LAC, and the LNS with the highest tunnel connection priority provides access service of the Intranet for a remote user. The load sharing among LNS is realized, and the access quality of service of the remote user and the utilization rate of network sources are improved.
Description
Technical Field
The present invention relates to network communication technologies, and in particular, to a method for establishing a remote Access virtual private network (Access VPN) connection and an Access concentrator (LAC).
Background
Virtual Private Network (VPN) is a new technology that is rapidly developed in this year with the widespread use of the Internet, and is used to implement the construction of private networks on a shared network. A Layer Two Tunneling Protocol (L2 TP) VPN belongs to an Access VPN, and provides business trip employees, remote offices, and remote small offices with a private network connection to an Intranet (Intranet) through a shared network.
The Access VPN connection has two types, one is the user initiated Access VPN connection, and the other is the Access VPN connection initiated by the Access server. As shown in fig. 1, the Access VPN connection initiated by the user may be accessed to an Access concentrator (LAC) of a Network Access Server (NAS) by using some Access technology, and when the accessed remote user meets a preset condition, that is, when the user is a valid user, the LAC initiates a tunnel connection to a layer two tunnel network server (LNS). Usually, in order to ensure the reliability of the network, a plurality of LNSs are set in the Intranet, where one LNS is used as a main device, and the other LNS are used as standby devices, when the LAC initiates a tunnel connection to the LNS, it first defaults to initiate a tunnel connection request to the main LNS, and if the main LNS is available, a tunnel connection is established with the main LNS, so that the remote user accesses the Intranet; and if the main LNS is unavailable, initiating tunnel connection to the standby LNS according to a preset sequence.
It can be seen that in the above method for establishing Access VPN connection, if the main LNS is available, when all remote users Access the Intranet, the LAC establishes tunnel connection with the main LNS, and the main LNS provides the Access service of the Intranet for all remote users, which obviously causes the processing burden of the main LNS, and the Access service quality of the remote users is affected by the processing performance of the main LNS and the bandwidth between the LAC and the main LNS, and reduces the utilization rate of network resources.
Disclosure of Invention
In view of this, the present invention provides a method for establishing Access VPN connection and an LAC, so as to implement load sharing among multiple LNSs, and improve Access service quality of a remote user and utilization rate of network resources.
A method for establishing an Access VPN is applied to the Access VPN comprising a LAC and more than two LNSs connected with the LAC, and comprises the following steps:
when the LAC determines that a legal remote user needs to access the Intranet, the tunnel connection priority of each LNS is determined according to the link quality between each LNS and the LAC, the LNS with the highest tunnel connection priority is selected to establish tunnel connection with the LAC, and the LNS with the highest tunnel connection priority provides the Intranet access service for the remote user.
A LAC applied to an Access VPN including the LAC and two or more LNSs connected to the LAC, the LAC comprising: the device comprises an access processing unit, a priority determining unit and a first connection establishing unit;
the access processing unit is used for sending a processing notice to the priority determining unit when a legal remote user needs to access the Intranet;
the priority determining unit is configured to determine a tunnel connection priority of each LNS according to the link quality between each LNS and the LAC after receiving the processing notification;
the first connection establishing unit is configured to select an LNS with the highest tunnel connection priority to establish a tunnel connection with the LAC.
It can be seen from the above technical solutions that, in the present invention, when it is determined that a valid remote user needs to access the Intranet, the LAC determines the tunnel connection priority of each LNS according to the link quality between each LNS and the LAC, selects the LNS with the highest tunnel connection priority to establish tunnel connection with the LAC, and provides the access service of the Intranet for the remote user by the LNS with the highest tunnel connection priority. That is, the load sharing between the LNSs is realized according to the link quality between the LNSs and the LAC, so that the processing load of each LNS and the bandwidth occupancy rate of each LNS link are balanced, and the access service quality of the remote user and the utilization rate of network resources are improved.
Drawings
FIG. 1 is a diagram illustrating the establishment of an Access VPN connection in the prior art;
FIG. 2 is a flow chart of a detailed method provided by the present invention;
FIG. 3 is a diagram illustrating an example of establishing an Access VPN connection according to the present invention;
fig. 4 is a schematic structural diagram of the LAC provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The method provided by the invention mainly comprises the following steps: when the LAC determines that a legal remote user needs to access the Intranet, the tunnel connection priority of each LNS is determined according to the link quality between each LNS connected with the LAC and the LAC, the LNS with the highest tunnel connection priority is selected to establish tunnel connection with the LAC, and the LNS with the highest tunnel connection priority provides the Intranet access service for the remote user.
Since when the LAC selects the LNS for establishing the tunnel connection, it is usually necessary to consider the link quality condition between the LAC and the LNS first, such as the traffic condition, which can be represented by the bandwidth and the actual bandwidth occupancy. When the LAC determines that a legal remote user needs to access the Intranet, the LAC can determine the tunnel connection priority of each LNS in real time according to the link quality condition, and selects the LNS with the highest tunnel connection priority to establish tunnel connection. The above-described method provided by the present invention is described in detail below.
Fig. 2 is a flowchart of a detailed method provided in an embodiment of the present invention, and as shown in fig. 2, the method may include the following steps:
step 201: and the remote user accesses the LAC, and the LAC carries out validity authentication on the remote user.
The remote user may access the LAC by dialing, for example, the LAC may be accessed by dialing using ethernet to carry point-to-point protocol CLIENT (PPPoE CLIENT) software, in the dialing process, the remote user inputs user authentication information such as a user name and a password, and the LAC performs legitimacy authentication on the remote user by using the user authentication information, and if the authentication passes, the remote user is determined to be a valid user, otherwise, the remote user is determined to be an illegal user.
Step 202: the LAC determines whether the load sharing condition is satisfied, if so, step 203 is executed; otherwise, the LAC directly establishes tunnel connection with the main LNS, and the main LNS provides access service of Intranet for remote users.
In the present invention, a load sharing condition may be preset, and the set load sharing condition may adopt various ways, for example, it may be set whether a bandwidth condition occupied by current user traffic on a link between the main LNS and the LAC reaches a preset bandwidth condition threshold, if so, the LAC is triggered to start load sharing on each LNS for a remote user currently needing to access the Intranet, that is, step 203 is continuously executed, otherwise, the LAC still establishes a tunnel connection with the main LNS, and the main LNS provides an access service of the Intranet for the remote user.
Step 203: the LAC determines the link quality between each LNS and the LAC.
In this step, the link quality Q of the link between LNS and LAC identified as j (hereinafter referred to simply as the link identified as j)jCan be represented by formula
Calculating, wherein A is a positive constant; sjIs the sum of the products of each link quality parameter value in the link marked as j and the weight value corresponding to the link quality parameter value, namely QjAnd SjIn an inversely proportional relationship, SjThe smaller the value of (c), the link quality QjThe higher.
The chainThe value of the path quality parameter may be an absolute value of each link quality parameter, or may be a rank value of each link quality parameter. The case where the link quality parameter value is an absolute value is easily understood and will not be described in detail here. The following describes a case where the link quality-to-link quality parameter value adopts the rank value of the link quality parameter, and S at this timejCan be as follows:
The link quality parameters may include: one or any combination of device hop count, message return time, link bandwidth, or link cost in the link.
When all the above link quality parameters are included, Sj＝Rankj(RTT)×Wj(RTT)+Rankj(TLL)×Wj(TLL)+Rankj(BD)×Wj(BD)+Rankj(Cost)×Wj(Cost), wherein, RTT is a message return time, which may be a time from sending a heartbeat (Ping) message to the LNS by the LAC to receiving the Ping message returned by the LNS; TLL is the device hop count in the link; BD is link bandwidth; cost is the link Cost, which can reflect the congestion status of the current link.
The message return time, the device hop count in the link, and the link bandwidth can be obtained through a traffic analysis process, for example, by installing Network Traffic Analysis (NTA) software and Network Quality Analysis (NQA) software, and in addition, the link bandwidth can also be read from a physical port on the LAC connected to the LNS. The link cost of each link may be a value set by the user according to the congestion status of the link. The manner of obtaining the link quality parameter values is the prior art in the prior art, and is not described herein again.
Rank value Rank of link quality parameter identified as i for link identified as jijCan be as follows: the difference between the absolute value of the link quality parameter identified as i for the link identified as j and the minimum absolute value of the link quality parameter in each link is divided by the base value of the link quality parameter. The formula may be:
wherein A isij(x) For the absolute value of the link quality parameter denoted i on the link denoted j, Ai(min) is the minimum absolute value of the link quality parameter identified as i in each link, Ai(base) is the base value of the link quality parameter identified as i, AiThe (base) may be a preset empirical value, or may be an average value of the absolute values of the link quality parameters identified as i for all links.
Taking the time of returning the message as an example,
wherein RTT isj(x) The absolute value of the packet return time of the link denoted by j is represented by RTT (min), which is the minimum value of the packet return time of each link, and RTT (base), which is the average value of the packet return time of each link.
The weight corresponding to the link quality parameter can be preset according to the actual condition of the network.
Step 204: and determining the tunnel connection priority of each LNS by using the link quality between each LNS and the LAC.
In this step, it may be determined that the higher the link quality is, the higher the tunnel connection priority corresponding to the LNS is, by using the link quality between each LNS and the LAC determined in step 203.
Preferably, when determining the tunnel connection priority, in addition to considering the link quality between each LNS and the LAC, the packet processing capability of each LNS may be further considered. The packet processing capability of each LNS may consider factors such as hardware configuration and device performance of the LNS, and the packet processing capability level of each LNS is set after the factors are evaluated, for example, the packet processing capability level of each LNS may be set to be a value between 1 and 100, and a higher value indicates that the packet processing capability of the LNS is stronger. The packet processing capabilities of the LNSs may not be considered if the packet processing capabilities of the LNSs are comparable.
At this point, the tunnel connection priority P of the LNS identified as jj＝Qj×LjWherein L isjFor the packet processing capability of the LNS identified as j, the link between the LNS identified as j and the LAC is also identified as j.
Step 205: and the LAC establishes tunnel connection with the LNS with the highest connection priority, and the LNS with the highest tunnel connection priority provides access service of Intranet for the remote user.
The above method is described as an example, and as shown in fig. 3, it is assumed that a business trip employee, that is, the remote user 1, connects to the Internet by accessing to the LAC device, and the LAC starts to select the LNS after determining that the remote user 1 is a valid user.
Assuming that LNS1 is the active LNS, and LNS2 and LNS3 are the standby LNS, the preset load sharing condition is that the bandwidth occupied by the current user traffic on the link between the active LNS and the LAC exceeds 30% of the available bandwidth of the link. If the bandwidth occupied by the current user traffic on the link between LNS1 and LAC exceeds 30% of the available bandwidth of the link, it is determined that the load sharing condition is met, and the LAC starts to determine the link quality between the LAC and each LNS. Assume that the value of link quality between LAC and LNS1 is 60, the value of link quality between LAC and LNS2 is 100, the value of link quality between LAC and LNS3 is 100, and the packet handling capability value of LNS1 is 100, the packet handling capability value of LNS2 is 80, and the packet handling capability value of LNS3 is 50. At this time, the tunnel connection priority of each LNS is:
the tunnel connection priority P1 of LNS1 is 100 × 60 is 6000;
the tunnel connection priority P2 of LNS2 is 80 × 100 is 8000;
the tunnel connection priority P3 of the LNS3 is 50 × 100 or 5000.
It can be seen that the tunnel connection priority of the current LNS2 is the highest, and the LAC chooses to initiate a tunnel connection request to LNS2, establish a tunnel connection with LNS2, and transmit the traffic of remote user 1 on the established tunnel.
The above is a detailed description of the method provided by the present invention, and the following is a detailed description of the system and apparatus provided by the present invention. The Access VPN system related by the invention comprises: the system structure can be seen in fig. 3, and 3 LNSs are taken as an example in fig. 3.
And the LAC is used for determining the tunnel connection priority of each LNS according to the link quality between each LNS and the LAC when a legal remote user needs to access the Intranet, and selecting the LNS with the highest tunnel connection priority to establish tunnel connection with the LAC.
And the LNS is used for providing the access service of the Intranet for the remote user after the tunnel connection with the LAC is selected.
Fig. 4 is a schematic structural diagram of the LAC provided in the present invention, and as shown in fig. 4, the LAC may include: an access processing unit 401, a priority determination unit 402 and a first connection establishment unit 403.
An access processing unit 401, configured to send a processing notification to the priority determining unit when it is determined that a valid remote user needs to access the Intranet.
When the remote user logs in the LAC, the access processing unit 401 performs validity authentication on the remote user, determines that the remote user is valid after the authentication is passed, and starts to select an LNS for the remote user to establish a two-layer tunnel connection.
A priority determining unit 402, configured to determine a tunnel connection priority of each LNS according to link quality between each LNS and the LAC after receiving the processing notification.
A first connection establishing unit 403, configured to select an LNS with the highest tunnel connection priority to establish a tunnel connection with the LAC.
Specifically, the priority determining unit 402 may first determine the link quality between each LNS and the LAC, and determine the tunnel connection priority of each LNS according to a principle that the tunnel connection priority of an LNS corresponding to a link with higher link quality is higher; or determining the link quality between each LNS and the LAC, determining the packet processing capability of each LNS, and determining the tunnel connection priority of each LNS by comprehensively considering the link quality and the packet processing capability of the LNS.
Wherein, the priority determining unit 402 may be specifically according to a formula
Determining a link quality Q between an LNS and an LAC identified as jjWherein A is a positive constant, SjIs the sum of the products of the values of the link quality parameters in the link between the LNS and the LAC of the mark j and the weight values corresponding to the link quality parameters.
The link quality parameters may include: one or any combination of device hop count, message return time, link bandwidth, or link cost in the link.
In addition, the values of the link quality parameters may be: an absolute value of a link quality parameter or a rank value of a link quality parameter.
Wherein the Rank value Rank of the link quality parameter identified as i of the link between the LNS and the LAC identified as jijComprises the following steps:
Aij(x) Is the absolute value of the link quality parameter identified as i on the link between LNS and LAC identified as j, Ai(min) is the minimum absolute value of the link quality parameter identified as i in the link between each LNS and LAC, Ai(base) is presetOr an average of the absolute values of the link quality parameters identified as i in the links between the LNS and the LAC.
Further, the LAC may further include: a load sharing trigger unit 404 and a second connection establishing unit 405.
A load sharing triggering unit 404, configured to receive the processing notification sent by the access processing unit 401, determine whether a preset load sharing condition is met, and send the processing notification to the priority determining unit if the preset load sharing condition is met; otherwise, a processing notification is sent to the second connection establishing unit 405.
The preset load sharing condition may be: the bandwidth condition occupied by the current user traffic on the link between the active LNS and the LAC in the two or more LNSs reaches a preset bandwidth condition threshold.
And a second connection establishing unit 405, configured to establish a tunnel connection with an active LNS of the two or more LNSs after receiving the processing notification.
It can be seen from the above description that, in the present invention, when it is determined that a valid remote user needs to access the Intranet, the LAC determines the tunnel connection priority of each LNS according to the link quality between each LNS and the LAC, selects the LNS with the highest tunnel connection priority to establish tunnel connection with the LAC, and provides the access service of the Intranet for the remote user by the LNS with the highest tunnel connection priority. That is, the load sharing between the LNSs is realized according to the link quality between the LNSs and the LAC, so that the processing load of each LNS and the bandwidth occupancy rate of each LNS link are balanced, and the access service quality of the remote user and the utilization rate of network resources are improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (12)
1. A method for establishing a remote Access virtual private network Access VPN is applied to the Access VPN comprising an Access concentrator LAC and more than two layers of tunnel network servers LNS connected with the LAC, and is characterized by comprising the following steps:
when the LAC determines that a legal remote user needs to access an Intranet in an enterprise, determining the tunnel connection priority of each LNS according to the link quality between each LNS and the LAC, selecting the LNS with the highest tunnel connection priority to establish tunnel connection with the LAC, and providing Intranet access service for the remote user by the LNS with the highest tunnel connection priority.
2. The method of claim 1, wherein determining a tunneling priority for each LNS based on link quality between each LNS and the LAC comprises: the LAC determines the link quality between each LNS and the LAC, and determines the tunnel connection priority of each LNS according to the principle that the tunnel connection priority of the LNS corresponding to the link with higher link quality is higher; or,
and the LAC determines the link quality between each LNS and the LAC, determines the packet processing capacity of each LNS, and determines the tunnel connection priority of each LNS by comprehensively considering the link quality and the packet processing capacity of the LNS.
3. The method of claim 2, wherein the determining the link quality between each LNS and the LAC comprises: according to the formula
Determining a link quality Q between the LNS identified as j and the LACjWherein A is a positive constant, SjIs the sum of the products of the value of each link quality parameter in the link between the LNS of the mark j and the LAC and the weight value corresponding to the link quality parameter.
4. The method of claim 3, wherein the value of the link quality parameter comprises: an absolute value of the link quality parameter or a rank value of the link quality parameter;
wherein a Rank value Rank of a link quality parameter identified as i for a link between the LNS identified as j and the LACijComprises the following steps:
wherein A isij(x) Is the absolute value of a link quality parameter identified as i on the link between the LNS identified as j and the LAC, Ai(min) for each LNSMinimum absolute value of a link quality parameter, A, identified as i, in the link with the LACi(base) is a preset empirical value or an average of the absolute values of the link quality parameters identified as i in the links between each LNS and the LAC.
5. The method according to claim 3 or 4, wherein the link quality parameter comprises: one or any combination of device hop count, message return time, link bandwidth, or link cost in the link.
6. The method of any of claims 1 to 4, further comprising, prior to determining the tunneling priority of each LNS based on the link quality between each LNS and the LAC: the LAC judges whether a preset load sharing condition is met, if so, the step of determining the tunnel connection priority of each LNS according to the link quality between each LNS and the LAC is continuously executed; otherwise, the LAC establishes tunnel connection with a main LNS in the more than two LNSs, the main LNS provides an Intranet access service for the remote user, and the process is ended.
7. The method of claim 6, wherein the load sharing condition is: and the bandwidth occupied by the current user traffic on the link between the active LNS and the LAC reaches a preset bandwidth condition threshold.
8. A LAC applied to an Access VPN including the LAC and two or more LNSs connected to the LAC, the LAC comprising: the device comprises an access processing unit, a priority determining unit and a first connection establishing unit;
the access processing unit is used for sending a processing notice to the priority determining unit when a legal remote user needs to access the Intranet;
the priority determining unit is configured to determine a tunnel connection priority of each LNS according to the link quality between each LNS and the LAC after receiving the processing notification;
the first connection establishing unit is configured to select an LNS with the highest tunnel connection priority to establish a tunnel connection with the LAC.
9. The LAC of claim 8, wherein the priority determining unit determines the link quality between each LNS and the LAC, and determines the tunnel connection priority of each LNS according to a principle that the tunnel connection priority of the LNS corresponding to a link with higher link quality is higher; or determining the link quality between each LNS and the LAC, determining the packet processing capability of each LNS, and determining the tunnel connection priority of each LNS by comprehensively considering the link quality and the packet processing capability of the LNS.
10. The LAC according to claim 9, wherein said priority determination unit is in particular according to a formula
Determining a link quality Q between the LNS identified as j and the LACjWherein A is a positive constant, SjThe sum of the products of the value of each link quality parameter in the link between the LNS of the mark j and the LAC and the weight value corresponding to the link quality parameter;
the link quality parameters include: one or any combination of device hop count, message return time, link bandwidth, or link cost in the link.
11. The LAC of claim 10, wherein the values of the link quality parameters comprise: an absolute value of the link quality parameter or a rank value of the link quality parameter;
wherein a Rank value Rank of a link quality parameter identified as i for a link between the LNS identified as j and the LACijComprises the following steps:
wherein A isij(x) Is the absolute value of a link quality parameter identified as i on the link between the LNS identified as j and the LAC, Ai(min) is the minimum absolute value of the link quality parameter identified as i in the links between each LNS and the LAC, Ai(base) is a preset empirical value or an average of the absolute values of the link quality parameters identified as i in the links between each LNS and the LAC.
12. The LAC of any of claims 8-11, further comprising: a load sharing trigger unit and a second connection establishing unit;
the load sharing triggering unit is used for receiving the processing notification sent by the access processing unit, judging whether a preset load sharing condition is met, and if so, sending the processing notification to the priority determining unit; otherwise, sending the processing notice to the second connection establishing unit;
and the second connection establishing unit is used for establishing tunnel connection with the main LNS in the more than two LNSs after receiving the processing notification.
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| CN103227773A (en) * | 2012-03-31 | 2013-07-31 | 杭州华三通信技术有限公司 | Method and system for establishing virtual private dial-up network connection |
| CN103227773B (en) * | 2012-03-31 | 2016-05-11 | 杭州华三通信技术有限公司 | A kind of method and system thereof of setting up VPDN connection |
| CN102710520A (en) * | 2012-06-01 | 2012-10-03 | 浙江宇视科技有限公司 | Method and device for backing up lonworks network service (LNS) |
| CN102710520B (en) * | 2012-06-01 | 2015-07-15 | 浙江宇视科技有限公司 | Method and device for backing up lonworks network service (LNS) |
| CN102917408A (en) * | 2012-10-26 | 2013-02-06 | 迈普通信技术股份有限公司 | Downlink flow control method and system of LNS (L2TP network server) device in 3G (third-generation) network |
| CN102917408B (en) * | 2012-10-26 | 2015-05-20 | 迈普通信技术股份有限公司 | Downlink flow control method and system of LNS (L2TP network server) device in 3G (third-generation) network |
| CN103973706A (en) * | 2014-05-23 | 2014-08-06 | 杭州华三通信技术有限公司 | Standby LNS (L2TP Network Server) optimization method and device |
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Application publication date: 20110511 |